package com.ruoyi.framework.jackson;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.ser.std.NumberSerializer;

import java.io.IOException;

/**
 * 超出 JS 最大最小值 处理
 *
 * @author Lion Li
 */
@JacksonStdImpl
public class BigNumberSerializer extends NumberSerializer {

	/**
	 * 根据 JS Number.MAX_SAFE_INTEGER 与 Number.MIN_SAFE_INTEGER 得来
	 */
	private static final long MAX_SAFE_INTEGER = 9007199254740991L;
	private static final long MIN_SAFE_INTEGER = -9007199254740991L;

	/**
	 * 提供实例
	 */
	public static final BigNumberSerializer INSTANCE = new BigNumberSerializer(Number.class);

	public BigNumberSerializer(Class<? extends Number> rawType) {
		super(rawType);
	}

	@Override
	public void serialize(Number value, JsonGenerator gen, SerializerProvider provider) throws IOException {
		// 超出范围 序列化位字符串
		if (value.longValue() > MIN_SAFE_INTEGER && value.longValue() < MAX_SAFE_INTEGER) {
			super.serialize(value, gen, provider);
		} else {
			gen.writeString(value.toString());
		}
	}
}
